千寻位置CORS-RTK在建筑基坑放样中的应用

Application of the Qianxun SI CORS-RTK in the Foundation Pit Staking

针对目标放样区被围墙遮挡,基准站架设点位于道路中央的情况下,无法使用传统的全站仪放样法和单连续运行参考站-实时动态(CORS-RTK)放样法的问题.采用了千寻位置服务系统,利用网络CORS-RTK方法进行工程建设中基坑的放样,介绍网络连续运行参考站(CORS)的原理及优点,对放样点数据进行处理,分析了放样精度.结果表明通过RTK测得37个放样点平面坐标,X方向中误差在20mm之内的点占97%,Y方向中误差在20mm之内的点占100%,比较集中稳定;点位中误差小于20mm的占95%,在20～40mm占5%,CORS-RTK方法的测量点位中误差均满足国家《卫星定位城市测量技术规范》CJJTT73-2010要求的平面点位中误差小于70mm的精度要求.千寻的CORS测量符合工程规范精度要求,对减少工程施工放样的工作量具有重要意义.

For the problem that the target lofting area is blocked by the wall and the base station is located at the center of the road,the traditional total station lofting method and the single-base CORS-RTK lofting method cannot be used.Qianxun SI service system and the network CORS-RTK method are used to stake out the foundation pit in the engineering construction.The principle and advantages of the network CORS are introduced,and the data of the lofting points are processed and the lofting accuracy is analyzed in the paper.The results show that the plane coordinates of 37 lofting points are measured by RTK,the error in the X direction within 20 mm is 97%,the error in the Y direction within 20 mm is 100%,which is relatively concentrated and stable;95%of the error in the position is less than 20 mm,5%of the error in the position is 20-40 mm,the error in the measurement point of the CORS-RTK method meets the accuracy requirement of less than 70 mm in the plane point required by the National Satellite Positioning City Measurement Technical Specification CJJTT73-2010.The CORS measurement of Qianxun SI meets the accuracy requirements of engineering specifications and is of great significance for reducing the workload of engineering construction.